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It's a feature that when tracing is off you don't see
anything drawn -- updating the screen after each line is
drawn is too expensive. If you really want this, please make
it a separate flag.

Regarding the new methods added: can you explain why you
need these?

Finally, please submit a documentation patch. If you don't
know LaTeX, try to emulate what's there in
Doc/lib/libturtle.tex, and we'll fix it for you, but we
won't write the docs for you.